"A database that is spread across multiple servers, often in multiple geographical locations, is called a federated database. The servers that hold the different parts of a federated database are referred to as a federation, or federated database servers. A federation of database servers is used to spread the processing load across a group of servers. The data is horizontally partitioned allowing each of the servers to be independently managed, but distributed queries can be used to process requests on the entire database." (Darril Gibson, "MCITP SQL Server 2005 Database Developer All-in-One Exam Guide", 2008)
"A database system wherein constituent databases, that are geographically decentralized and using various computer systems, are interconnected via a computer network or software that allows metasearching via a single platform. Since the constituent database systems remain autonomous, a federated database system is a contrastable alternative to the task of merging together several disparate databases." (Mila M. Ramos et al, "The CGIAR Virtual Library Bridging the Gap Between Agricultural Research and Worldwide Users", 2009)
"A set of databases that are documented and then interconnected to operate as one database, even when those databases are on different platforms." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
[federated data warehouse:] "1.A conceptual Data Warehouse made up of multiple decision support databases, potentially on multiple servers, but presented transparently to Business Intelligence users as a unified schema for query, analysis, and reporting. 2.An Enterprise Data Warehouse fed by extracts from departmental Data Warehouses and/or legacy Data Warehouses prior to their incorporation and/or retirement." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
"A distributed database management system (DBMS) that consists of a DB2 instance that operates as a server, a database that serves as the federated database, one or more data sources, and clients (users and applications) who access the database and data sources. A federated system can be used to query and manipulate data that is located on other data servers." (Sybase, "Open Server Server-Library/C Reference Manual", 2019)
"In a federated system, the database that is within the federated server. Users and applications interface with the federated database. To these clients, the data sources and the federated database seem to be a single database." (Sybase, "Open Server Server-Library/C Reference Manual", 2019)
"A set of linked servers that shares the processing load of data by hosting partitions of a distributed partitioned view." (Microsoft Technet)
"A system in which multiple databases appear to function as a single entity. However, the databases typically involved in this kind of system exists independently of the others. Once the different databases are 'combined', one federated database is formed." (Solutions Review)
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